/* hardware/pc/physmem/mod.rs
 *
 * Copyright (c) 2014, Chris Williams (diosix.org)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

/* provide an interface between the physical memory and the kernel,
   and related functions */

extern "cdecl"
{
  fn hw_get_kernel_phys_start() -> *u64;
  fn hw_get_kernel_size() -> u64;
  
  fn hw_get_kernel_boot_phys_start() -> *u64;
  fn hw_get_kernel_boot_size() -> u64;
}

/* physmem::describe_kernel
   <= return physical RAM start address of the loaded kernel
      and size of loaded kernel in bytes
*/
pub fn describe_kernel() -> (*u64, u64) 
{
  (
    unsafe
    {
      hw_get_kernel_phys_start()
    },
    unsafe
    {
      hw_get_kernel_size()
    }
  )
}

/* physmem::describe_kernel_boot
   <= return physical RAM start address of the kernel's boot section
      and size of the boot section in bytes      
*/
pub fn describe_kernel_boot() -> (*u64, u64)
{
  (
    unsafe
    {
      hw_get_kernel_boot_phys_start()
    },
    unsafe
    {
      hw_get_kernel_boot_size()
    }
  )
}

